GB1517723A - Camera exposure control systems - Google Patents

Camera exposure control systems

Info

Publication number
GB1517723A
GB1517723A GB2833175A GB2833175A GB1517723A GB 1517723 A GB1517723 A GB 1517723A GB 2833175 A GB2833175 A GB 2833175A GB 2833175 A GB2833175 A GB 2833175A GB 1517723 A GB1517723 A GB 1517723A
Authority
GB
United Kingdom
Prior art keywords
pulses
diaphragm
counter
count
gate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2833175A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP49081211A external-priority patent/JPS5110932A/ja
Priority claimed from JP49088099A external-priority patent/JPS5751086B2/ja
Priority claimed from JP49114014A external-priority patent/JPS5140925A/ja
Priority claimed from JP12655774A external-priority patent/JPS5152825A/ja
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB1517723A publication Critical patent/GB1517723A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/091—Digital circuits
    • G03B7/097—Digital circuits for control of both exposure time and aperture

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Shutters For Cameras (AREA)
GB2833175A 1974-07-17 1975-07-04 Camera exposure control systems Expired GB1517723A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP49081211A JPS5110932A (de) 1974-07-17 1974-07-17
JP49088099A JPS5751086B2 (de) 1974-08-02 1974-08-02
JP49114014A JPS5140925A (de) 1974-10-03 1974-10-03
JP12655774A JPS5152825A (ja) 1974-11-05 1974-11-05 Shiboriojidohoseisurukamera

Publications (1)

Publication Number Publication Date
GB1517723A true GB1517723A (en) 1978-07-12

Family

ID=27466536

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2833175A Expired GB1517723A (en) 1974-07-17 1975-07-04 Camera exposure control systems

Country Status (3)

Country Link
US (1) US4074289A (de)
DE (1) DE2531858C3 (de)
GB (1) GB1517723A (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5642216A (en) * 1979-09-14 1981-04-20 Copal Co Ltd Program exposure control unit by open photometry suited for lens interchangeable camera
JPS56153326A (en) * 1980-04-30 1981-11-27 Konishiroku Photo Ind Co Ltd Aperture control method
US4734731A (en) * 1987-02-05 1988-03-29 W. Haking Enterprises Limited Filmspeed-corrected digital exposure control system for electronic cameras
US5150149A (en) * 1991-07-25 1992-09-22 Eastman Kodak Company Multi-aperture electromagnetic camera shutter
CN100389363C (zh) * 2003-12-09 2008-05-21 北京中星微电子有限公司 一种曝光脉冲发生器，曝光发生装置，以及曝光脉冲输出的方法
US7796830B2 (en) * 2006-08-15 2010-09-14 Nokia Corporation Adaptive contrast optimization of digital color images

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5629253B2 (de) * 1973-02-01 1981-07-07
DE2319167C3 (de) * 1973-04-16 1986-05-28 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Belichtungssteuervorrichtung für fotografische Kameras
US3903528A (en) * 1973-05-22 1975-09-02 Polaroid Corp Exposure control system for photographic apparatus
JPS5067650A (de) * 1973-10-17 1975-06-06
US3900855A (en) * 1973-11-12 1975-08-19 Polaroid Corp Exposure control system and method
US3969735A (en) * 1974-03-11 1976-07-13 Asahi Kogaku Kogyo Kabushiki Kaisha Camera with automatic exposure-determining structure

Also Published As

Publication number Publication date
US4074289A (en) 1978-02-14
DE2531858A1 (de) 1976-02-05
DE2531858C3 (de) 1978-12-07
DE2531858B2 (de) 1978-04-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee